9701_s23_qp_12
A paper of Chemistry, 9701
Questions:
40
Year:
2023
Paper:
1
Variant:
2
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8
Thevolumeofavesselis1.20s10–3m3.Itcontainspureargonatapressureof1.00s105Pa, andatatemperatureof25.0°C.Undertheseconditionsitcanbeassumedthatargonbehavesas anidealgas. Which mass of argon does it contain?
22. Analytical techniques  →  22.2. Mass spectrometry
4. States of matter  →  4.1. The gaseous state: ideal and real gases and \( pV = nRT \)
2. Atoms, molecules and stoichiometry  →  2.4. Reacting masses and volumes (of solutions and gases)
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9
A student mixed 25.0cm3 of 4.00moldm–3 hydrochloric acid with an equal volume of 4.00moldm–3 sodium hydroxide. The initial temperature of both solutions was 15.0°C. The maximum temperature recorded was 30.0°C. The heat capacity of the final solution can be assumed to be 4.18JK–1g–1 and the density of this solution can be assumed to be 1.00gcm–3. Using these results, what is the enthalpy change of neutralisation of hydrochloric acid?
5. Chemical energetics  →  5.1. Enthalpy change, \(\Delta H\)
11. Group 17  →  11.4. The reactions of chlorine
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14
Hydrogeniodideisaddedtoanevacuatedreactionvessel.Thevesselissealedandwarmed.A decompositionreactionoccurs.Hydrogenandiodineareformed.Somehydrogeniodideremains. Whenequilibriumisestablished,thetotalpressureis1.20s105Pa.Thepartialpressureofhydrogen is4.00s103Pa. Hydrogeniodide,hydrogenandiodineareallgaseousundertheconditionsused. WhatisthevalueofKpfortheequilibriumatthistemperature,assumingthedecompositionisthe forwardreaction?
11. Group 17  →  11.2. The chemical properties of the halogen elements and the hydrogen halides
17. Carbonyl compounds  →  17.1. Aldehydes and ketones
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17
L, M and N are three different elements from Period 3 of the Periodic Table. L is the element whose atoms have three unpaired electrons in its 3p sub-shell. M is the element with the highest electrical conductivity in the period. N is the element with the highest melting point in the period. Which statement about element L is correct?
9. The Periodic Table: chemical periodicity  →  9.1. Periodicity of physical properties of the elements in Period 3
9. The Periodic Table: chemical periodicity  →  9.2. Periodicity of chemical properties of the elements in Period 3
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19
Sodium, magnesium, aluminium, silicon and phosphorus are all elements in Period 3 of the Periodic Table. Three statements about the oxides and chlorides of these elements are given. The ionically bonded oxides all react with dilute hydrochloric acid. All metal chlorides produce neutral solutions when added to water. The two most electronegative elements both form covalently bonded chlorides. Which statements are correct?
9. The Periodic Table: chemical periodicity  →  9.2. Periodicity of chemical properties of the elements in Period 3
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22
ammonium chloride A ammonium sulfate B sodium chloride C sodium hydroxide D J dissolves in water to give an aqueous solution K. K gives a dense white precipitate when aqueous silver nitrate is added. When heated with aqueous potassium hydroxide, K gives off a gas that turns moist universal indicator paper blue. What is J?
7. Equilibria  →  7.2. Brønsted–Lowry theory of acids and bases
11. Group 17  →  11.3. Some reactions of the halide ions
11. Group 17  →  11.4. The reactions of chlorine
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23
effect on pH of soil higher percentage of nitrogen by mass decrease ammonium nitrate A increase ammonium nitrate B decrease ammonium sulfate C increase ammonium sulfate D Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers. These salts have different percentages by mass of nitrogen. They have the same effect as each other on the pH of wet neutral soil. Which row is correct?
12. Nitrogen and sulfur  →  12.1. Nitrogen and sulfur
7. Equilibria  →  7.2. Brønsted–Lowry theory of acids and bases
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30
Alkynes are hydrocarbons that contain one triple C≡C bond. Like alkenes, alkynes take part in addition reactions. A saturated compound can be formed. For example, ethyne, H–C≡C–H, reacts with an excess of hydrogen to form ethane. Propyne, C3H4, undergoes an addition reaction with an excess of hydrogen bromide in two stages. Markovnikov’s rule applies to the addition of HBr at each stage. What is the main product obtained when propyne reacts with an excess of hydrogen bromide?
14. Hydrocarbons  →  14.2. Alkenes
14. Hydrocarbons  →  14.1. Alkanes
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